feat: Added SubFolder and localAssets configuration(#1324)

Co-authored-by: eaglexmw <eagle_xmw@163.com>

conf/config.go

@@ -28,6 +28,8 @@ type Config struct {
 	Address  string      `json:"address" env:"ADDR"`
 	Port     int         `json:"port" env:"PORT"`
 	Assets   string      `json:"assets" env:"ASSETS"`
+	LocalAssets string   `json:"localassets" env:"LOCALASSETS"`
+	SubFolder string     `json:"subfolder" env:"SUBFOLDER"`
 	Database Database    `json:"database"`
 	Scheme   Scheme      `json:"scheme"`
 	Cache    CacheConfig `json:"cache"`
@@ -39,6 +41,8 @@ func DefaultConfig() *Config {
 		Address: "0.0.0.0",
 		Port:    5244,
 		Assets:  "https://npm.elemecdn.com/alist-web@$version/dist",
+		SubFolder: "",
+		LocalAssets: "",
 		TempDir: "data/temp",
 		Database: Database{
 			Type:        "sqlite3",